info1 = "D:\tools\noco"
info2 = r"D:\tools\noco"
info3 = "D:\tools\noco"
info4 = '张三说："你很厉害"'
print(info1)
print(info2)
print(info3)
print(info4)

info = "abcdefgkl"
print(info[3])
print(info.find("e"))
print(info.find("k"))


info = ['Python', 'java', 'PHP']
num = [11, 22, 33]
info1 = " and ".join(info)
print(info1)
print(type(info1))


sql = "SelECt * from students where id = 001;"
print(sql.split())
for i in sql.split():
    print(i)
print(sql.split("where"))


phone = " 13800000001 "
print(phone)
print(phone.strip())
sql = "SelECT * from students where id = 001;"
if "select" in sql.lower():
    print("显示查询结果")
else:
    print("非查询")

